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High efficiency quasi 2D lead bromide perovskite solar cells using various barrier molecules


This work reports on high power conversion efficiency (PCE) and high open circuit voltage (Voc) of bromide-based quasi 2D perovskite solar cells. Voc of more than 1.4V and at the same time, a PCE of 9.5% for cells with holes transport material (HTM), were displayed, whereas a Voc value of 1.37V and PCE of 7.9% were achieved for HTM-free-based cells. The bromide quasi 2D perovskite were synthesized using various long organic barriers (e.g., benzyl ammonium-BA, phenylethyl ammonium-PEA, and propyl phenyl ammonium-PPA). The influence of different barriers’ molecules on the quasi 2D perovskite’s properties was studied using absorbance, X-ray diffraction, and scanning electron microscopy. No change was observed in the exciton binding energy as a result of changing the barrier molecule. Density functional theory (DFT) with Spin-orbit coupling calculations showed that in the case of BA, holes are delocalized over the whole molecule, whereas for PEA and PPA, they are delocalized more at the phenyl ring. This factor influences the electrical conductivity of holes, which is the highest for BA in comparison with the other barriers. In case of electrons, the energy onset for the nonzero conductivity is the lowest for BA. Both calculations support the better PV performance observed for the quasi 2D perovskite based on the BA as the barrier. Finally, using contact angle measurements, it was shown that the quasi 2D perovskite is more hydrophobic than the 3D perovskite. Stability measurements showed that cells based on quasi 2D perovskite are more stable than cells based on 3D perovskite.

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Publication details

The article was received on 25 Jun 2017, accepted on 09 Aug 2017 and first published on 10 Aug 2017

Article type: Paper
DOI: 10.1039/C7SE00311K
Citation: Sustainable Energy Fuels, 2017, Accepted Manuscript
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    High efficiency quasi 2D lead bromide perovskite solar cells using various barrier molecules

    B. E. Cohen, M. Wierzbowska and L. Etgar, Sustainable Energy Fuels, 2017, Accepted Manuscript , DOI: 10.1039/C7SE00311K

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